Novel insights into the surface microstructures of lead(II) benzohydroxamic on oxide mineral

He, Jianyong; Han, Haisheng; Zhang, Chenhu; Xu, Zhijie; Yuan, Dandan; Pan, Chen; Sun, Wei; Hu, Yuehua

doi:10.1016/j.apsusc.2018.07.085

Cited by 30 publications

(14 citation statements)

References 56 publications

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“…Very few heavy metal ion complexes of BHA chelates have been extensively investigated for their special uses, such as the bismuth(III) complex that has activity against Helicobacter pylori; however, reports about the novel Pb(II)-BHA complexes are also few. Understanding the microstructures of Pb(II)-BHA complexes is essential to improve the technique working in flotation practice and fundamental field of lead chemistry [36][37][38][39].…”

Section: Of 16mentioning

confidence: 99%

New Insights into the Configurations of Lead(II)-Benzohydroxamic Acid Coordination Compounds in Aqueous Solution: A Combined Experimental and Computational Study

Han

Zhang

et al. 2018

Minerals

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Novel collector lead(II)-benzohydroxamic acid (Pb(II)–BHA) complexes in aqueous solution were characterized by using experimental approaches, including Ultraviolet-visible (UV-Vis) spectroscopy and electrospray ionization-mass spectrometry (ESI-MS), as well as first-principle density functional theory (DFT) calculations with consideration for solvation effects. The Job plot delineated that a single coordinated Pb(BHA)+ should be formed first, and that the higher coordination number complexes can be formed subsequently. Moreover, the Pb(II)–BHA species can aggregate with each other to form complicated structures, such as Pb(BHA)2 or highly complicated complexes. ESI-MS results validated the existence of Pb-(BHA)n=1,2 under different solution pH values. Further, the first-principles calculations suggested that Pb(BHA)+ should be the most stable structure, and the Pb atom in Pb(BHA)+ will act as an active site to attack nucleophiles. These findings are meaningful to further illustrate the adsorption mechanism of Pb(II)–BHA complexes, and are helpful for developing new reagents in mineral processing.

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Section: Of 16mentioning

confidence: 99%

New Insights into the Configurations of Lead(II)-Benzohydroxamic Acid Coordination Compounds in Aqueous Solution: A Combined Experimental and Computational Study

Han

Zhang

et al. 2018

Minerals

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“…Although these methods have enhanced the interface compatibility between the mica and the organic coating to some extent, the technology of the intermediate coupling agent is too complex to industrialize. Besides, the strength of physical grafting is weak, and the coating tends to easily detach from the substrate [ 25 , 26 , 27 ]. Therefore, finding a simple and efficient modification method with a high graft rate and graft strength has become a hot research topic.…”

Section: Introductionmentioning

confidence: 99%

The Effect of the Modification of Mica by High-Temperature Mechanochemistry on the Anticorrosion Performance of Epoxy Coatings

et al. 2021

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Epoxy resin was directly grafted onto the surface of mica powder by high-temperature mechanical ball milling. This method was used to achieve a chemical reaction between the epoxy resin and mica that cannot be carried out under conventional circumstances. The results show that an epoxy resin layer with a thickness of approximately 10 nm formed on the surface of the mica. This modified mica filler exhibited a significant change in its hydrophilic properties. The dispersion of mica and its compatibility with organic coatings also significantly improved. In addition, the modified mica filler was added to the epoxy coating. The improvement of the coating’s compactness and toughness is the reason for its anti-corrosion performance enhancement.

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“…Flotation is one of the most efficient methods to purify useful minerals from the complex raw ores based on the distinct surface hydrophobicity of minerals. − In the flotation system, metal ions are conventionally pre-added as activators to alter the surface, which means that metal ions are pre-adsorbed on the surface and restricted on the surface. Flotation reagents are subsequently added to alter the surface hydrophobicity.…”

Section: Introductionmentioning

confidence: 99%

Interface Interaction of Benzohydroxamic Acid with Lead Ions on Oxide Mineral Surfaces: A Coordination Mechanism Study

Sun

Chen

et al. 2021

Langmuir

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Surface coordination chemistry is important in areas such as adsorption, separation, and catalysts. In this work, surface coordination interactions of benzohydroxamic acid (BHA) with the lead ion [Pb(II)] adsorbed on the cassiterite surface have been investigated by first-principles calculations due to its great significance in froth flotation. Cluster calculations show that BHA possesses the weakest chelation with Pb(II) due to the electron withdrawal ability of the benzyl ring in comparison with other hydroxamic acids. Pb(II) thermodynamically prefers to react with the cassiterite surface rather than BHA. On the other hand, the partial density of states and the atomic overlap populations have consistently verified that the adsorption of BHA results in a better symmetry in electron densities than the hydrated Pb(II). The electron density maps and the electronic localization functions have further visualized the rearrangement of the 6s2 lone pair around the lead atom. It can be concluded that the surface coordination mechanisms of Pb(II) on oxide minerals can be attributed to the coordination ability of BHA and the unique electronic structure of Pb(II), which accounts for the reported better flotation performance of the pre-assemble strategy than the pre-activating approach. This work sheds some new light on the unique coordination activation mechanism of metal ions on oxide mineral surfaces. It should be instructive to design and screen new environment-friendly flotation reagents and flotation flowsheets.

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Novel insights into the surface microstructures of lead(II) benzohydroxamic on oxide mineral

Cited by 30 publications

References 56 publications

New Insights into the Configurations of Lead(II)-Benzohydroxamic Acid Coordination Compounds in Aqueous Solution: A Combined Experimental and Computational Study

New Insights into the Configurations of Lead(II)-Benzohydroxamic Acid Coordination Compounds in Aqueous Solution: A Combined Experimental and Computational Study

The Effect of the Modification of Mica by High-Temperature Mechanochemistry on the Anticorrosion Performance of Epoxy Coatings

Interface Interaction of Benzohydroxamic Acid with Lead Ions on Oxide Mineral Surfaces: A Coordination Mechanism Study

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